From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Blueprint drawing of a combined hub and drum in aluminium.
| Identifier | ExFiles\Box 141\2\ scan0352 | |
| Date | 3rd May 1941 guessed | |
| COMBINED HUB & DRUM IN ALUM SQ. HD{Mr Hayward/Mr Huddy} BOLT. TO BE DRIVE FIT IN HUB 7/16" 3 1/2" DIA 2 7/8" DIA. 4 1/8" DIA. | ||